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World Economic Forum, Davos

US actress Goldie Hawn speaks during a panel session on the second day of the World Economic Forum, WEF, in Davos, Switzerland. Photograph: Laurent Gillieron/EPA

US Secretary of State John Kerry departs Montreux, Switzerland for Davos. Photograph: Gary Cameron /Reuters

Former British prime minister Minister Tony Blair speaks with Sheikh Abdullah Bin Mohammed Al Thani , chairman of Ooredoo of Quatar on the second day of theWorld Economic Forum (WEF), in Davos, Switzerland, 23 January 2014. Photograph: Laurent Gillieron/EPA

A helicopter pad is seen in the early morning in front of the InterContinental Hotel before the start of the annual meeting of the World Economic Forum (WEF) 2014 in Davos . Photograph: Ruben Sprich/Reuters

Matt Damon (L), actor and co-founder of Water.org, laughs next to former US vice-president Al Gore at the annual meeting of the World Economic Forum (WEF). Photograph: Denis Balibouse/Reuters

Participants stand in the lobby of the congress centre on the first day of the 44th Annual Meeting of the World Economic Forum, WEF, in Davos, Switzerland,. Photograph: Laurent Gillieron/EPA

Marissa Mayer, chief executive officer of Yahoo! pauses during a session on the opening day of the World Economic Forum (WEF). Photographer: Chris Ratcliffe/Bloomberg

An attendee uses a personal mobile tablet as he stands near a logo inside the Congress Center on the opening day of the World Economic Forum (WEF) in Davos, Switzerland. Photograph: Chris Ratcliffe/Bloomberg

Japanese prime minister Shinzo Abe, (C), listens a panel session on the first day of the 44th Annual Meeting of the World Economic Forum, WEF, in Davos, Switzerland. Photograph: Laurent Gillieron/EPA

Iranian president Hassan Rowhani (C) walks in the corridors on the first day of the 44th Annual Meeting of the World Economic Forum, WEF, in Davos. Photograph: Laurent Gillieron/EPA

A helicopter lands at Zurich airport, Zurich, Switzerland, as attendees arrive for the first day of the 44th Annual Meeting of the World Economic Forum, WEF, in Davos. Photograph: Steffen Schmidt/EPA

Nikesh Arora , senior vice-president and chief business officer of Google chats with Sunil Bharti Mittal, chairman of Bharti Enterprises (R) during a session at the annual meeting of the World Economic Forum (WEF) in Davos. Photograph: Denis Balibouse/Reuters

Neelie Kroes, competition commissioner for the European Union, pauses during a television interview on the opening day of the World Economic Forum (WEF) in Davos, Switzerland. Photograph: Simon Dawson/Bloomberg

Delegates sit in a corridor and watch a session on a screen on the opening day of the World Economic Forum (WEF) in Davos, Switzerland. Photograph: Jason Alden/Bloomberg

Participants break for lunch between sessions during the annual meeting of the World Economic Forum (WEF) in Davos. Photograph: Ruben Sprich/Reuters